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| A part of the air that is needed by most plants and animals to live. |
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| A living thing that carries out five basic life functions on its own. |
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| The smallest unit of living matter. |
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| A group of similar cells that work together to carry out a job. |
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| A group of tissues that work together to do a certain job. |
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| A group of organs that work together to carry on life functions. |
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| The largest group into which an organism can be classified. |
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| A characteristic of a living thing. |
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| A group made up of two or more very similar species. |
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| The smallest group into which an organism is classified. |
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| Any evidence of an organism that lived in the past. |
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| A developing organism that results from fertilization. |
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| Said of an organism no longer alive on Earth. |
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| The living and nonliving things in an environment and all their interactions. |
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| The living part of an ecosystem. |
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| One type of organism living in an area. |
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| One type of organism living in an area. |
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| An organism, such as a plant, that makes food. |
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| Any organism that eats the food producers make or eats other consumers. |
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| An organism that breaks down wastes and the remains of other organisms. |
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Definition
| A set of steps in which organisms get the food they need to survive. |
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| The pattern that shows how food chains are related. |
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Definition
| A long period of time with little or no precipitation. |
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| A depletion of resources that occurs when too many of at least one kind of living thing inhabits an ecosystem. |
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| The adding of harmful substances to the water, air, or land. |
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| Harmful moisture that falls to Earth after being mixed with wastes from burned fossil fuels. |
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| One of the threadlike cells on a root that take in water and minerals from the soil. |
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Definition
| The outermost protective layer of a leaf. |
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Definition
| Pores in the bottom of leaves that open or close to let in air or give off water vapor. |
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Definition
| A plant's release of excess water vapor through the stomata on the underside of its leaves. |
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Definition
| A green substance in plant cells that helps plants make food by trapping the Sun's energy. |
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| A process in plants that uses energy from sunlight to make food from water and carbon dioxide. |
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Definition
| The using and releasing of energy in a cell. |
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| An undeveloped plant with stored food sealed in a protective covering. |
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Definition
| The sprouting of a seed into a new plant. |
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Definition
| The transfer of a flower's pollen from anther to pistil. |
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Definition
| The joining of a female sex cell, the egg, and a male sex cell, the sperm, to produce a fertilized egg. |
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| A structure containing egg cells. |
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| The cells in a seedless plant that grows into new organisms. |
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